Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

27046 results found.

  1. GRB 130315A: Swift/UVOT Upper Limits
  2. GRB 130315A: SALT optical observations
  3. GRB 130315A: Swift-XRT refined Analysis
  4. GRB 130315A, Swift-BAT refined analysis
  5. GRB 130313A: Swift/UVOT Upper Limits
  6. GRB 130305A: PTF P48 optical upper limits
  7. GRB 130315A: Swift detection of a burst
  8. GRB 130310A : Suzaku WAM observation of the prompt emission
  9. GRB 130313A: RATIR Optical and NIR Observations
  10. Swift-BAT trigger 551030 is not astrophysical
  11. GRB 130313A: NOT optical upper limit
  12. GRB 130313A: Swift-XRT refined Analysis
  13. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  14. GRB 130313A: Weihai optical upper limit
  15. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  16. GRB 130313A: Swift-BAT refined analysis
  17. GRB 130313A: Zadko observatory - Gingin optical observations
  18. GRB 130313A: Swift detection of a short burst
  19. IPN Triangulation of GRB 130307A
  20. GRB 130306A: Swift Detection of a Possible Afterglow
  21. GRB 130310A: Fermi GBM detection
  22. GRB 130310A: Fermi-LAT detection and localization
  23. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  24. GRB 130306A: Swift-BAT refined analysis
  25. IPN triangulation of GRB 130228A
  26. GRB 130305A: Further Swift-XRT Observations
  27. Konus-Wind observation of GRB 130306A
  28. GRB 130307A: Fermi GBM detection
  29. GRB 130306A: Fermi GBM observation
  30. GRB 130306A: MASTER-Net pre-Swift alert observation
  31. GRB 130305A: Swift/UVOT Upper Limit
  32. GRB 130305A: RATIR Observations
  33. GRB 130306A: Swift detection of a burst
  34. GRB 130305A: P60 Observations
  35. GRB 100615A: HST host detection and X-shooter redshift
  36. GRB 130305A: Swift/XRT detection of the afterglow
  37. Konus-Wind observation of GRB 130305A
  38. GRB 130305A: Fermi GBM observation
  39. GRB 130305A: Fermi LAT Detection
  40. Fermi GBM trigger 130301.638 is not GRB
  41. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  42. GRB 130305A found in ground analysis of Swift/BAT data
  43. GRB 121128A: optical observations in Mondy observatory
  44. GRB 130216A: Swift/UVOT Upper Limit
  45. GRB 130219A: Suzaku WAM observation of the prompt emission
  46. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  47. Trigger 549841: Swift detection of SGR1806-20
  48. GRB 130216B: Suzaku WAM observation of the prompt emission
  49. GRB 130216A: Swift/XRT observations
  50. IPN Triangulation of GRB 130219A
  51. GRB 130215A: Suzaku WAM observation of the prompt emission
  52. GRB 130215A: PTF P48 optical detection
  53. GRB 130219A: Fermi GBM detection
  54. GRB 130216B: Swift/XRT observations
  55. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  56. GRB 130216A: Fermi GBM observation
  57. GRB 130216B: Fermi GBM observation
  58. GRB 130216A: possible early detection at 15 GHz
  59. GRB 130216B BAT refined analysis
  60. GRB 130216B: P200 NIR Observations
  61. GRB 130216A: P200 NIR Observations
  62. GRB 130216A: Swift-BAT refined analysis
  63. GRB 130216A: TAROT La Silla observatory optical observations
  64. GRB 130216B: Burst found in ground analysis of BAT data
  65. GRB 130216A: Swift detection of a burst
  66. GRB 130215A: GROND Detection of the Optical/NIR Afterglow
  67. GRB 130215A: Fermi GBM detection
  68. GRB 130215A: RAPTOR Measurements
  69. GRB 130215A: Xinglong optical observations
  70. GRB 130215A: Swift-BAT refined analysis
  71. GRB 130215A: TAROT La Silla observatory optical observations
  72. GRB 130215A: RATIR Optical and NIR Observations
  73. GRB 130215A: P60 Observations
  74. GRB 130215A: ROTSE-III data analysis
  75. GRB 130215A: Redshift estimate
  76. Skynet Observations of GRB130215
  77. GRB 130215: ROTSE-III Detection of Optical Counterpart
  78. GRB 130215A: Swift detection of a burst
  79. Swift GRB130206A: late XRT observations.
  80. GRB 130131B: CTIO 0.9-m optical upper-limits
  81. GRB 130211A: Swift/UVOT Upper Limits
  82. GRB 130211A: Swift-XRT refined Analysis
  83. GRB 130211A: Swift-BAT refined analysis
  84. GRB 130211A: GROND detection of the afterglow
  85. GRB 130211A: Swift detection of a burst
  86. GRB 130122A: PTF P48 optical upper limits
  87. GRB 130206A: GROND Observations
  88. GRB 130206A: Fermi LAT Observations
  89. GRB 130206A: Fermi GBM observation
  90. GRB 130206A: XRT and UVOT follow-up observations.
  91. GRB 130206A, Swift-BAT refined analysis
  92. GRB 130206A: Zadko observatory - Gingin optical observations
  93. Swift GRB 130206A - analysis of Swift/UVOT initial data.
  94. GRB 130206A: Swift-XRT observations
  95. GRB 130131A: optical observation in Mondy observatory
  96. GRB 130206A: Swift detection of a burst
  97. GRB 130131A: Swift/UVOT Upper Limits
  98. GRB 130131B: RATIR Upper Limits
  99. GRB 130131A: RATIR optical and infrared upper limits
  100. GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov